Abstract The article describes the design of the working drum in a nut grinding machine and its design. Depending on the size of the nut and as a result of the experiments, the structure and dimensions of the parts of the nut grinder are determined and the basic procedure for preparing the parts in accordance with the structure is expressed. The rotation speed of the drum was determined taking into account the weight of the nut and centrifugal force. The speed with which the nut enters the device is calculated depending on the speed of rotation of the drum. The determination of this speed allows the machine to work normally, and at the same time increases its efficiency.